Nonoffset spraying device



Jan. 25, 1944. w, WILSON 2,339,899

NONOFFSET SPRAYING DEVICE Filed Dec. 9, 1941 2 Sheets-Sheet 1 INVENTOR.

WILLIAM WILSON I ATTORNEY".

Jan. 25, 1944. w w 2,339,899

NONOFFSET SPRAYING DEVICE Filed Dec. 9, 1941 2 Sheets-Sheet 2 INVENTOR.

F|G.|O. BY WILLIAM WILSON jfi. ATTORNEY.

Patented Jan. 25, 1944 NONOITSE'I SPBAIING DEVICE William Wilson, New York, N. Y.. assignor of onehalf to Joseph M. Rosohko. Brooklyn, N. Y.

Application Deoember s, 1941, Serial No. 422,267

" u cum. (on. 91-45) This invention relates to non-offset spraying devices. It is particularly directed to a spray using dry powder to prevent offsetting and operating entirely by air taken from the air line of the printing press itself.

An object of this invention is to provide'a spray. of the character described, to prevent offset in printing, which operates without motor or other electrical equipment, and in which there are no moving parts outside of the valve, and which may be connected to tap air from the usual air supply, which is used in the press to separate sheets. or which may receive compressed air from any suitable source.

A further object of this invention is to provide a highly improved spray device of the character described. which may be used in printing and allied trades to eliminate ink smearing on the sheets technically called ofisetting," said spray device being adapted to spray dry powder to obtain the same results which has heretofore usually been obtained with liquid sprays.

Still a further object of this invention is to provide in a device of thecharacter described. a pair of highly improved nozzles which may be 1'18. 3 is a cross-sectional viewtaken on line He! Fig.2: I

Fig. 4 is a view similar to Fig. 3, but illustratingamodified construction;

Fig. 5 is a side elevational view of the device illustrating the position of the device relative to the stack of printed sheets:

Fig. 61s a rear elevational view of the device relative to said stack;

H8. 7 is a front elevational view of one of the nozzles:

there extends upwardly a vertical tubular supadjustable to spray in any desired directions. one

or both of which may be used, the nozzles beins furthermore provided with means to catch drip of powder, and being furthermor provided with a removable screen to prevent lump of powder from being ejected by the spray.

Still a further object of this invention is to provide a compact and durable device of the character described, which shall be relatively inexpensive to manufacture. and practiealand eiil eient to a high degree in use.

Other objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combinations of elements. and arrangement of parts which will be exemplified in the construction hereinafter described.

and of which the scope of application will be indicated in the following claims.

In the accompanying drawings, in which is shown various possible illustrative embodiments V of this invention,

port l5. Mounted on tube It for vertical adjustment is a member 18 comprising a stem portion l1 received within the tube l5 and adapted to befixed thereto in various vertically adjusted positions by a set screw I 8, or in any other suitable manner.

Extending upwardly from the stem I! are three arms Ill, inclined upwardly and outwardly. The

arms 20 are spaced apart degrees from each other and fixed to their upper ends is a horizontal, fiat flxedring'2|. The hopper I2 comprises a substantially conical body portion 24 formed with a clean-out opening 25 at the bottom closed by a threaded plug 28. The body 24 is formed with an annular outwardly extending flange 21 at its upper end contacting the ring 2 I.

The top of the container is closed by a closure member 30 having an annular fiang' dl at its periphery'resting upon the flange 21 and fixed thereto by screws 32 or in any other suitable manner. A gasket 34 of any suitable type may more formed witha central, screw threaded opening SI, and with a pair of screw threaded openings 39 on diametrically opposite sides of the central'opening. Screwed within the opening 38 is an air inlet pipe 40 projecting somewhat-below the underside of the top wall 30.

Pipe 4| has a constricted opening 42 at its 6| lower end. and is furthermore formed with a pair of diametrically opposed openings 43, just below the underside of top wall 30 and in alignment with the openings 39. The pipe 40 projects somewhat above the top wall 30, and attached to the upper end thereof, is a T-connection 40a to one branch of which is connected an air hose 45, leading to a valve 46 connected by a hose or pipe 41 to an air supply of a printing press. Pipe 41 may be tapped from the usual compressed air supply of the printing press which supplies air for separating the sheets. Valve 46 is formed with a spring pressed plunger 48 normally retained open by the spring 49 and adapted to close the valve when it is compressed. Pivoted to ears 50 on valve 46 is a lever 5| carryin a roller 52 at one end.

The printing press is provided with an oscillating shaft 53, which oscillates in synchronism with the printing mechanism, and fixed thereto is an arm 54 adapted to engage the roller 52. When the printing press is operating, arm 54 will oscillate to alternatingly open and close the valve 46 thus supplying compressed air intermittrleitly to pipe 40 and the inside of the hopper The top of T-connection 40a is closed by a plug 40b formed with an axial screw threaded opening 40c, through which extends screw threaded needle valve 4011 to adjust or close opening 42.

Mounted on the top wall 30 are a pair of substantially similar, symmetrically disposed, spray discharge members 60. Each comprises a vertical outlet pipe 6i screwed within one of the screw threaded openings 39 in the top wall 30. Screwed to the upper end of each pipe 6| is an elbow fitting 62, to which there is attached a pipe 63 inclined forwardly, upwardly and outwardly. Each pipe 63 may be provided with a clean-out plug 64, if desired. Attached to the upper end of each pipe 63 is another elbow 65, to which there is connected a flexible tube 88.

' Attached to each tube 66 is a forwardly extending nozzle member (0. One of the pipes 8| may be provided with a handcock or valve H, so that if desired. one of the discharge members 50 may be shut off so that either one or both discharge members may be used.

Each nozzle 10 comprises ,a flattened tubular member fixed to the outer end of the flexible 16- and I1 and increases in width toward the outer end thereof. Said member 15 has an open mouth 18 at its forward end. The top wall 15 thereof however extends beyond the open mouth, forming a lip 19 having a transverse slot 80, for the purpose hereinafter appearing. The lip I9 is wider than the mouth I8, as shown in Fig. 8 of the drawings.

Extending outwardly from the bottom wall H are wings 82. slidably mounted on said wings is a pan 85. The same comprises a bottom wall 88, upwardly extending side walls 81 and inwardly extending, horizontal, aligned flanges 80 contacting the upper surfaces of the wings 82. Extending upwardly from the front end of the bottom wall 86 is a lip or flange 90, extending substantially half the height of member 05. The bottom wall 86 is formed with a pair of spaced openings, through which there extends clamping screws 9! adapted to contact the underside of wings 82.

By loosening the screws 9|, the pan 85 may be slidably moved backward or forward relative to the nozzle member 15. As the powder is forced '50 tube 66. Member .15 has top and bottom walls through the nozzle member, the drippings will be caught within the pan. Furthermore, by longitudinally adjusting the pan relative to the nozzle member, the spray may be prevented from dropping too soon after it leaves the mouth 18.

Mounted on lip 19 is a filter member I00. Filter member I00 comprises a frame l0l slidably extending through the slot 80. The frame l0l comprises folded back portions I02 having outwardly extending flanges 103 at their upper ends. Portions, I02 are formed with registering frame openings I05. Inserted between walls I02 is a metal screen member H0.

It will now be understood that the powder must pass through the screen I I0, thus preventing lumps from being discharged onto the printing sheets. The pan as well as the filter may be removed for the purpose of cleaning.

The position of the spraying device relative to the stack of printed sheets P is illustrated in Figs. 5 and 6 of the drawings. It will be obvious that the height of the discharge elements may be regulated by moving member l2 up or down on the stand. Furthermore, the flexible-tubes 66 permit adjustment of the nozzles in any desired direction. If desired, one of the discharge elements may be shut off by means of valve H, and in such event, the entire device may be shifted to bring the other discharge nozzle into central location relative to the stack of printed sheets P.

In Fig. 4 there is shown a modified construction, in which' the short pipe 40 is substituted by a pipe 40a, to the lower end of which there is attached an axial pipe 40b extending down to a point somewhat above the lower end of the hopper.

The operation of the device will now be described:

The container is filled with powder to a point below the lower end of pipe 40. As arm 54 oscillates compressed air will be intermittently fed to the hopper through pipe 40. The air passing through the lower opening 42 agitates the powder, and the air passing through the openings 43 will direct the powder to the outlet tubes 6|. The

compressed air will force the powder upwardly through tube GI and through the discharge nozzles 10 onto each of the printed sheets as it is laid on the stack P.

In the device illustrated in Fig. 4, the agitation is adjacent the apex of the hopper 24.

Although the tank is shown as being mounted on a separate stand, it is understood that the tank in the entire spray device may be mounted directly on any suitable part of the press, eliminating necessity for using the adjustable stand.

The container or receptacle l2 furthermore may have fiat sides instead of being conical in shape. It is an advantage, however, that the container decrease in cross-sectional area toward the bottom to allow for easy drainage of powder through the clean-out opening 25, when the plug 28 is removed. Furthermore, with such construction, the amount of air required to agitate the full container is sufficient for a small amount of powder, that is, when there is more powder in the tank or receptacle l2, it is closer to the nozzle 40 and receives a stronger pressure of air to agitate the same. When the height of the powder in the tank decreases, the powder is further away from the nozzle, but there is less powder to be agitated, and therefore, less air pressure is required to agitate the same.

It will be noted that only one of the air dis charge elements 70 'is provided with a shut on valve or cock II. The advantage of leaving one discharge element without a shut off valve is that the operator can see the powder being discharged, thus serving as a reminder to shut off the air supply to the container. If both of the discharge elements had shut ofl valves, the operator might close both and leave the main air supply to the tank open.

It will be noted that the nozzle 15 increases in cross-sectional area towards its mouth and is fan shaped, thus serving todecrease the force of velocity of the air, and preventing the powder from being discharged at too great a velocity from the nozzle, so that the powder will start dropping almost as soon as it leaves the nozzle. Furthermore, the powder starts spreading within the nozzle and gently falls onto the printed sheets and thus prevents blowing .of the powder all over the press or beyond the printed sheets.

It will be noted furthermore that i with applicants construction, the nozzles point toward the press and not away from the press, so that the powder cannot blow into the operators face.

It is noted that in Fig. 3, there are three openings in nozzl 40, two upper openings and one lower opening, thus providing three agitators for the powder. The lower opening may be shut off. When the lower opening 42 is shut oil, the air from openings 43 will have a tendencyto pass through the pipes 6| without involving a great deal of powder agitation, and the air blowing through the discharge members serves to clean out the pipes and nozzles. The device is therefore partly self-cleaning. The large refill cap 31 is easily removable to permit a person to seethe amount of powder in the container.

It will be noted that the pipes 6| and 63 may be made-of any desired size and are replaceable for different sizes of presses.

Although the spray device as illustrated has two discharge devices, any additional amount of container, and a pair outlet pipes extending said container, said outlet pipes having openings within said container in alignment with said pair of openings in the inlet pipe, and nozzles connected to said outlet pipes. by flexible pipe connections.

4. A device for spraying powder to prevent offset and comprising a container formed with a central opening, an air inlet pipe passing through said opening, and projecting into the container, and formed with an opening within said container, and with a pair of spaced openings within said container, a pair of outlet pipes on said container having openings in alignment with said pair of openings in the inlet pipe, nozzles connected to said outlet pipes by flexible pipe condischarge devices may be employed. The screens nections, and a valve on one of said outlet pipes.

5. A' device'for spraying powder to prevent oilset and comprising a container formed with an opening, an air-inlet pipe passing through said opening, and projecting into the container, and formed with an opening at its lower end, and with a pair of spaced openings within said container, a pair of outlet pipes on said containerhaving openings in alignment with said pair of openings in the inlet pipe, nozzles connected to said outlet pipes by flexible pipe connections, and a valve on one of said outlet pipes, said outlet pipes being provided with clean-out plugs.

6. A device for spraying powder to prevent of!- set and comprising a container formed with an opening, an air inlet pipe passing through said opening, and projecting into the container, and formed with an opening at its-lower end, and with a pair of spaced openings within said container, a pair ofoutlet pipes on said container having openings in alignment with said pair of openings in the inlet pipe, nozzles connected to said outlet pipes by flexible pipe connections, and

a valve on one or said outlet pipes, said outlet made of the above invention, and as various as new and desire to secure by letters Patent:

1. In a-spray device of the character described, a container adapted to contain powder to be sprayed, an air inlet pipe passing through the top of the container, a pair of pipes fixed to the top of the container, and disposed on opposite sides of the inlet pipe, spraying nozzles connected to said pipes, said inlet pipe extending into the container, and formed with openings directed toward the outlet pipes so asto project air thereto.

2. A device for spraying powder to prevent oilset and comprising a container. formed with an opening, anair inlet pipe passing through said opening, and projecting into the container, and formed with an opening within said container,

pipes being provided with clean-out plugs, said container having a plugged opening.

having openings in alignment with said pair of openings in the inlet pipe, nozzles connected to said outlet pipes by flexible pipe connections, and a valve on one of said outlet pipes, said outlet pipes being provided with clean-out plugs, said container'having a plugged opening at its lower end, the top of said container being formed with a plugged opening through which powder may be fed to the container.

8. In a spray device, a container, an air inlet pipe connected thereto. an outlet pipe on said container, a nozzle on said outlet pipe. a drip pan slidably mounted on said nozzle, means for fixing the drip pan to the nozzle at various ad- .iusted positions, and a screen filter at the mouth and with a pair of spaced openings within said of said nozzle,

9. A device for spraying powder to prevent offset and comprising a container formed with an opening, an air inlet pipe passing through said opening, and projecting into the container, and formed with an opening at its lower end, and with a pair of spaced openings within said container, a pair of outlet pipes on said container having openings in alignment with said pair of openings in the inlet pipe, nozzles connected to said outlet pipes by flexible pipe connections, and a valve on one of said outlet pipes, said outlet pipes being provided with clean-out plugs, said container having a plugged opening at its lower end, the top of said container being formed with a plugged opening through which powder may be fed to the container, said nozzle being connected to the outlet pipe by a flexible pipe connection.

10. In a non-offset device, a container for powder, a nozzle projecting into said container, and 20 having a plurality of openings communicating with the interior or the container, means to supply air to said nozzle, means to shut oi! one of said openings, a discharge device on said container, and said other openings being directed toward said discharge device soas to project air thereto.

11. In a spray device of the character described, a container adapted to contain powder to be sprayed, an'air inlet pipe passing through the top of the container, a pair of pipes fixed to the top of the container, and disposed on opposite sides of the inlet pipe, spraying nozzles connected to said pipes, said inlet pipe extending into the container, and formed with openings directed toward the outlet pipes so as to project air thereto, said inlet pipe being formed with an additional opening within said container. and adjustable means to constrict and close said last opening.

- WILLIAM WILSON. 

